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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52ee8f5e422cf9beee6af8ea322d4cefa107aeb563d1e5d0dd18bb80527797e' 
  AND token = '4r+EkYanoWz/IaOiir9Dm+vQj/6uF+/6HbQFnDywtzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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