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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb86f79f929034b21c4b073b0dcce2e5bfdea4f3791b290a32fbd95a6791e1c8' 
  AND token = 'Xj0TkJempe3o/1H7o/IDmdfr37AjRFSwJWG5r/mSbcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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