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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c70dc266662ffb498496dc94a9709b61d688d66deff79ded3fb5a5021b38ae7' 
  AND token = 'RX7d2EjY060d1RL27Nbj1GKDzo7Jkt6ba6GKuU42hnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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