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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73fb3ed0e1b02584f0b6f9095a572d0a5c86f0396512e2ef4461240ee23e975' 
  AND token = 'uJS7xjVtAmCShlttAUJKChGIdAG9/doYb0EL2Tit6TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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