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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310add0b55b569f1fb4fe730218286e449aa472509f138738a50ac3d6759671e' 
  AND token = 'zSuslO0MQO6W3xVmmdLJC2LsLP9sPhbm11IzQ/VS7EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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