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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eba9a6a32e8e0d5a4c38600d63524794c6f1f53c54f3845ce250b010cb3feda' 
  AND token = 'JahKVenF2O8zFRRwE76fwGVhqdrfd9tyVVb8AlEh/O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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