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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aca7274732053b4b6b9099899daf2bac2850e7794ab58e82b73415ba711eac6' 
  AND token = 'ZdSQ8xZzJXV0ImP/EPqgmO2JZVlIz+4N3n5nOwirzi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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