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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afdccc8a337918001e08e8fb66c0765a77016e9459175f04093738d6350675d' 
  AND token = '9bUhydPIrGPIvj1ey8IP4h5XqrJQuGeaO24DsWskIF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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