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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbda5446111cf8c442a17ceca53e1ae95984b0672ceadbef183825a6646e9fa2' 
  AND token = '/kaOyteBcJ9uqSz7+waiDtAOvcVFRwXDY+EUk1am4NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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