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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e3b2fb4832a85290564db5f5b7846b9242ebdd93bd7dfe6fe074ec516bd32f' 
  AND token = 'l2XuEAGuuGun7cAuKU8igdmz6YEma3yqbQPlAW9n/C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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