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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733a0a5b7961bb0856906ff9e01da77574f2aee0a325f31e2c7aa35bf021b35c' 
  AND token = 'B12gIUAL8JMU65tmKkRD2+YKPWAkylYxdLncJT+l0as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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