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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed93df93db5e4d50804e223a66b0813a3cfc5fda2e5d44bb799ce023eabb5df' 
  AND token = 'hikCwNGrb0d0xRYlZt6/BuAZV8n9L4UYeQbr4WRqNpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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