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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f7064e57c19711f7416d76dc121989776931184837e3208cc853df236a5a9b' 
  AND token = '7y7lRm1hPGsMfpoNdYnudU4LR9bGsKy7L6XW5NGh0sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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