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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec3379bc288507ab4b85566c22d8f6987071344a0a6d336b3d82822ce283216' 
  AND token = 'OU5m5k4eaMEWbSw69hrNFujGcqoJ/60SPBoR6dmjbic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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