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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03ff14eff85680a5ce38ad609121817db706a824190da500abe5182a2f6355c' 
  AND token = 'ykqORu89eUKiPYdnVWMeb6GhjGL3rgUlrAmq0SxiJIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}