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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dbc831b1eb060bf75abfefd107547e63f0d87eebf7afacfc5aa633fa7d5f7e' 
  AND token = '0XeBGXAqwA84igUk0D+towEActhRaDW8YElEFmtY8Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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