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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18819982f4334ccf97c7b2fff3c578506a33f7e2e92910cd61804f279970c23' 
  AND token = 'Pum876Wp6KejkoHwI4f+1jEFT2DAfl+4oWpqPPDFTRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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