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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6296e6022faa67c4d279302331c50fb7c4d6a58a0d36cb801fa31ae250510e49' 
  AND token = 'rNQLbiKaKQHr4V+ODtUbXWCWgvA+cB2EtnezVuDiWZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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