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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696dce92bcd77d9e43013761fafe71d978d307653f21768e202da27235342756' 
  AND token = 'zahzvxnd3Qiy+V84oCMPXO1XBpYjO7OSplyxQIdctAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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