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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438e7e2af1045dda4468d95c36c391d9df75c08b350fe759944c7c18bbe93d90' 
  AND token = 'H0nhnJQXNHPZORRFvia2T1my1wmh1pKYhZEyvZklF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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