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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1de9a430d6ebc851830f10422ae82b6b5b87dbade5cccfdb1f35a6d02e9b6' 
  AND token = 'PlxJ9JKZH3L2kHs+A3zFPmATUhRYnXcZ9z2Q74QfdmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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