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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc912fcfd294fc88eb7028f373584ede9c753bf681983504ca8dc0eb1813dc7' 
  AND token = 'v2tX+ysIL1H1Aj453AFQM5/Sw/jdb38Qsa5sQg2cYTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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