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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e698e38795378c4e38ef34b69f7e57b0bcc7ed8044cfce1e4d8043aa790c0ce' 
  AND token = 'aeR566iRaJJWjNER/A5UEXAjvjf5mLnfgXp/aAPlMwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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