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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f684c86dcf9e3045df4bdee65af7276caaec283a1b2b3e63e66bd2286e6ac21' 
  AND token = 'QsjOmBzELMwDPRBDmDtL7Ih4TKbk6QZY5LnD0cYmUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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