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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300787962f00ec21a45eb28d4ecaaa767ff30abc4252e1274dbecd9a77ca7487' 
  AND token = '2bZazhHZq5YCuWCUZX4+imxJMWLh44EE+FeF3Zfj+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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