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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738aa0823d6c97ab18ef105da305c902f5c77087ca7344925afbc1da0d6421fc' 
  AND token = 'xkMmbgo4PzW4ezlr2YNJcSuFtpsZR0lMMQK1W3fDuy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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