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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72503ff64af2f5aa3603acdeaa62341d317f51a512078d20b4897da609bc89ea' 
  AND token = 'UYT5tkic0Z3Wvrt26HfPtkJObPNi28xvks7eS7o+2EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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