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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999d02f32503e14b9d437f835dbca8d216f3957d068855c8daafa0f2c3038785' 
  AND token = 'QoSCDSTArTdgGDGh3bDcTZ0Ch4TsvTBQMnokJZ7lXFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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