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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c8fdee6ce4b014b675cfe6c9a9ebb520b343179249553d40063e7a5d29600' 
  AND token = '0rIJXI2b6IMbrRLWe/hfqXLWmmWDgqTWlNuexQkP/2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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