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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fa9ff0ede6907d9d8336a3345439cf905c7be31aaa1d980f76029744a93a49' 
  AND token = 'L598YNjEZ+TpHp1tjw9vMtl+aNoYQljhBATXmM+KRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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