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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8a1af33167884dc92f65e2ed8c9b32da887c35866f23e5aeee5d153748c56c' 
  AND token = 'e2sPcJQZrATT+B1awgUYaZyt5dKYetySSX4JCS0r/u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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