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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fad8d2f190d31ffdad7d3eb633668a2f71b3671a7c0b7297d6352fe0dcfebd' 
  AND token = '4/ZbJX9eiDDp2FJPf7F8Uc/eh+X1A6mwKZLf8H71M8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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