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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694085f01ec3cce9035e6bf4266910d7bc355170fa471e94dce943e66834aa70' 
  AND token = 'k10iG7hLB0Ba6vBqm6JfiYbDM1EHJ10KYlof0QAfDgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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