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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e39ce9d48b68342598e51892e8c91d1f79f629705bbbe6f1b902e0141b9e7e' 
  AND token = 'Iqjx9b6z3jhXUSqhl1ILJdocPkzA1QczAT9q1vWzPm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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