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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b73c526985a6bb18e9dc3298864d1eb81a63d6fad32a966bfc3afaf4451e88' 
  AND token = 'MKugwAVTiNboV+z1BQyC0TM7G4TcvoHt2NzfUp77yhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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