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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b041654c41f878ec855ed3fc443c4e6d2db38b9421179b95eaff63adc01aab98' 
  AND token = 'se9u0X9M2N6iNDQzzTSDDdU38pBa7lPoLdPrYSc9IIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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