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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc5d20912f936df9f182f17abe991af717b3b4d56cf2976c7d0fbcafb4cda2e' 
  AND token = 'sNJy+zsa/Dcobc14epTZ9KKhindV2tSxSA1yfiJOBI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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