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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846487bce10546888d45f1cd9707bc14665da45e4c1e479b92b3388acb00d87d' 
  AND token = 'Ca6EVXlDI2b5gIDTVneX/ZXLeYeATq45I56L1J/H7Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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