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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077d4b41983c11c7001192a80ce62bcfc6d611f0fcefc8610ef9191038bd7e9a' 
  AND token = 'DuBHlvbrh3uSpSORui4XOc/hhbg5P3625F7cVh14kKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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