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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd351103b2491e1703883c2a28b2ca71a998de97060a9136d48acc8432a7316d7' 
  AND token = 'R5owWlfQ2xIx9OkZrTJbGmLDlSasJv65O/u1OCuf1Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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