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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448546e27b3602454d823f94e08638445843349e830cab5dbf91874c26c23318' 
  AND token = 'PtdWOtbb6MPG8TtZa27voIkCLtBxCUnL/6Fc15gJgCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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