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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897585feea70198c2c2e5bdd80ec0462aacd9f30fc2c9b418350f3e4f946c113' 
  AND token = 'hpPxaNkjQJYYtBq4ol8jlu47l8ZwreWy51d/4BiBRmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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