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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802b60c43531754b52b0e8bcf7fd5deae5d42f83bbc3eac83e593b9b68c60d02' 
  AND token = 'a+sWuk93vqD+uRmRqnnEOeI49Dq+Wu+ZxawQ5Jveqp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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