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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b3881c0ff7be59465ef77bfb968deac7d25d644c7456fe9a6f61fddb7852fe' 
  AND token = 'ty0lAKXkiPlptDSfs0swh14gxp2oE2A9stZoM0+F8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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