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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47edbf10a09a650367a5ead2983c813bcde3e855ba91588969ae0e05a91a4390' 
  AND token = 'DHOopS2Sl20CDS1gT1Petwa4oBkyCB98PyY46jpEA4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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