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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f17df6e504bae45ee81cd568fa6fb5489d57db910ed7c8b2711427664170537' 
  AND token = 'glFJIRoHsMsrCze5D9lCCEMUJBt0HAoSll7WhMfjYvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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