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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4256262f5872efbf6d2c595fed19a2679db45b5424248705c9e801737e0e571f' 
  AND token = 'sU1wS13H3BDBJR8oKadD2lF7LHXoBPsJv1Snk4no3f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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