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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4510a841c77f1ef3e02ce786b962964873f7d814e041924ba6348032178ad40a' 
  AND token = '622J0Pv6f7+84fyslGtgG36ucbKw4TB/aDrsG/KS6lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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