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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f6946f045a0be897cdb03df334417657449b68404085fbfcb6a779cf574157' 
  AND token = '5PfhLgirFoPv/jRS1H0TAlxT0CI12IdHC54UybUTyRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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