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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f693db14e718083f83d00d213bbb6326c4dc8484a804f599c78eb2803fdc14b6' 
  AND token = 'A0M3s/f/G48gRteTZGeHpZIapK70gourfDEbbswlLW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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