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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90322c3630752ab9ad6958cc104c1c457dc70f649f061d223d35ddac0c34b77' 
  AND token = 'U7Ult4iQhViSE2xi58JGYwDDtsQupqhtAE8ebhKzn2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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